Rotating Packed Bed Nanofluid Synthesis
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Solution Overview
Problem
Conventional methods for preparing nanofluids face challenges such as nanoparticle agglomeration and sedimentation, leading to instability and difficulties in mass production, particularly in the multi-step method, while the one-step method struggles with controlling nanoparticle composition and slow production rates.
Innovation Solution
A one-step process using a rotating packed bed where an alkaline aqueous solution and an organic solution of metal acid salt are introduced, reacting under centrifugal force to form metal oxide nanoparticles dispersed in a hydrophobic fluid, enhancing dispersion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional multi-step methods are used to prepare nanofluids, then nanoparticle dispersion can be achieved, but the process complexity increases and production efficiency decreases
Solution Approach 1:
The patent combines nanoparticle synthesis and dispersion into a single integrated reaction step within the rotating packed bed reactor. The aqueous phase containing metal salt and the organic phase containing reducing agent react directly in the rotor to form nanoparticles that are simultaneously dispersed in the hydrophobic organic medium, eliminating separate synthesis and dispersion steps required by conventional methods.
Solution Approach 2:
The patent divides the reaction system into two immiscible phases (aqueous and organic) that are introduced separately into the rotating packed bed. This phase separation allows independent control of reactant concentrations and reaction conditions while achieving simultaneous synthesis and dispersion in one step, resolving the contradiction between process simplicity and dispersion quality.
2Stability of the object's composition
If conventional multi-step methods are used to prepare nanofluids, then nanoparticle dispersion can be achieved, but production time increases
Solution Approach 1:
The patent merges nanoparticle synthesis and dispersion into a single simultaneous process occurring within the rotating packed bed reactor. Both operations are completed in one continuous flow reaction, eliminating the sequential steps required by conventional methods and dramatically reducing production time while maintaining stable nanoparticle dispersion.
Solution Approach 2:
The rotating packed bed reactor enables continuous flow reaction where aqueous and organic phases continuously mix and react as they flow through the rotor. This continuous operation allows sustained nanoparticle synthesis and dispersion without batch processing interruptions, improving both production speed and dispersion stability.
3Productivity
If one-step method is used to prepare nanofluids, then production rate increases, but control over nanoparticle composition becomes difficult
Solution Approach 1:
The patent segments the reaction system into two separate immiscible phases (aqueous containing metal salt, organic containing reducing agent) that are introduced independently into the rotating packed bed. This allows precise control of each phase's composition and flow rate while achieving simultaneous reaction and dispersion in one step, resolving the contradiction between production speed and composition control.
Solution Approach 2:
The patent creates distinct local environments for different reactants by utilizing phase separation. The aqueous phase provides controlled metal ion release while the organic phase provides controlled reducing agent delivery, with each phase maintaining its own chemical environment. This local quality control enables precise nanoparticle composition control despite the one-step continuous process.
4Productivity
If one-step method is used to prepare nanofluids, then production efficiency improves, but nanoparticle stability may decrease
Solution Approach 1:
The patent uses the hydrophobic organic phase as an intermediary medium that serves dual functions: it acts as the reaction medium for nanoparticle formation and simultaneously serves as the dispersant that stabilizes the nanoparticles. The organic acid and its metal salt in the hydrophobic phase provide steric and electrostatic stabilization, preventing agglomeration and sedimentation while enabling continuous one-step production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process efficiently synthesizes nanoparticles with superior dispersion properties, enabling high production rates and stable nanofluids suitable for heat transfer and lubrication, with potential for mass production and improved performance.
Implementation Method 1
the two solutions of the aqueous phase and the hydrophobic phase flow radially through a packing of said rotating packed bed in a direction away from said axis under a centrifugal force
Implementation Method 2
Under the effect of a high gravity field, the material flow comes in contact with the rotating packed bed
Implementation Method 3
a base in the aqueous phase and the organic acid metal salt in the hydrophobic phase undergo reactions at the interface of the two phases, and thus metal oxide nanoparticles are formed
Implementation Method 4
The mass transfer process is greatly enhanced by the rotating packed bed
Data Source
AI summary
The present invention discloses a process for preparing a hydrophobic fluid containing metal oxide nanoparticles dispersed therein such as heat transfer fluids or lubricant fluids, including introducing an alkaline aqueous solution (aqueous phase) and an organic solution of an organic acid metal salt (hydrophobic phase) into a rotating packed bed, the two solutions flowing radially through the rotating packed bed under a great centrifugal force, so that the aqueous phase and the hydrophobic phase contact with each other, reactants in the two phases undergo reactions at the interface of the two phases rapidly, and thus metal oxide nanoparticles are formed. The metal oxide nanoparticles stably dispersed in the hydrophobic phase, which is nanofluid.